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| var camera, scene, renderer;
var isUserInteracting = false,
onMouseDownMouseX = 0, onMouseDownMouseY = 0,
lon = 0, onMouseDownLon = 0,
lat = 0, onMouseDownLat = 0,
phi = 0, theta = 0;
init();
animate();
function init() {
var container, mesh;
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 1100 );
camera.target = new THREE.Vector3( 0, 0, 0 );
scene = new THREE.Scene();
var geometry = new THREE.SphereBufferGeometry( 500, 60, 40 );
// invert the geometry on the x-axis so that all of the faces point inward
geometry.scale( -1, 1, 1 );
var material = new THREE.MeshBasicMaterial( {
map: new THREE.TextureLoader().load( 'textures/2294472375_24a3b8ef46_o.jpg' )
} );
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio ); // 防止在retina等屏幕上出现图像变形等显示问题
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
document.addEventListener( 'wheel', onDocumentMouseWheel, false );
//
document.addEventListener( 'dragover', function ( event ) {
event.preventDefault();
event.dataTransfer.dropEffect = 'copy';
}, false );
document.addEventListener( 'dragenter', function ( event ) {
document.body.style.opacity = 0.5;
}, false );
document.addEventListener( 'dragleave', function ( event ) {
document.body.style.opacity = 1;
}, false );
document.addEventListener( 'drop', function ( event ) {
event.preventDefault();
var reader = new FileReader();
reader.addEventListener( 'load', function ( event ) {
material.map.image.src = event.target.result;
material.map.needsUpdate = true;
}, false );
reader.readAsDataURL( event.dataTransfer.files[ 0 ] ); // 将读取到的文件编码成Data URL
document.body.style.opacity = 1;
}, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseDown( event ) {
event.preventDefault();
isUserInteracting = true;
onMouseDownMouseX = event.clientX;
onMouseDownMouseY = event.clientY;
onMouseDownLon = lon;
onMouseDownLat = lat;
}
function onDocumentMouseMove( event ) {
if ( isUserInteracting === true ) {
lon = ( onMouseDownMouseX - event.clientX ) * 0.1 + onMouseDownLon; // 0.1只是来控制速度
lat = ( event.clientY - onMouseDownMouseY ) * 0.1 + onMouseDownLat;
}
}
function onDocumentMouseUp( event ) {
isUserInteracting = false;
}
function onDocumentMouseWheel( event ) {
var fov = camera.fov + event.deltaY * 0.05;
camera.fov = THREE.Math.clamp( fov, 10, 75 );
camera.updateProjectionMatrix();
}
function animate() {
requestAnimationFrame( animate );
update();
}
function update() {
// if ( isUserInteracting === false ) {
// lon += 0.1;
// }
lat = Math.max( - 85, Math.min( 85, lat ) ); // 上下滑动距离控制在 -85 和 +85之间 来设置纬度
console.log('lat', lat);
console.log('lon', lon);
phi = THREE.Math.degToRad( lat ); // 角度（ 85-负85度！！！！）转弧度
theta = THREE.Math.degToRad( lon ); // 角度转弧度
// 自己做的公式
camera.target.x = 500 * Math.cos( theta );
camera.target.y = 500 * Math.sin( phi );
camera.target.z = 500 * Math.sin( theta );
// 原版公式
// camera.target.x = 500 * Math.sin( phi ) * Math.cos( theta );
// camera.target.y = 500 * Math.cos( phi );
// camera.target.z = 500 * Math.sin( phi ) * Math.sin( theta );
camera.lookAt( camera.target )
;
/*
// distortion
camera.position.copy( camera.target ).negate();
*/
renderer.render( scene, camera );
}
|
